One-liner command line gems

A list of one-liner command line gems

TCP Dump

Retrieve HTTP Headers and a human-readable format

sudo tcpdump -A -s 10240 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | egrep --line-buffered "^........(GET |HTTP\/|POST |HEAD )|^[A-Za-z0-9-]+: " | sed -r 's/^........(GET |HTTP\/|POST |HEAD )/\n\1/g'

Running wireshark on your host machine against a Kubernetes Pod

kubectl exec <pod> -- tcpdump -i eth0 -w - | wireshark -k -i -

Disk Usage

Find top 10 largest directories sorted in descending order by bytes

du -a /var | sort -n -r | head -n 10

1008372 /var
313236  /var/www
253964  /var/log
192544  /var/lib
152628  /var/spool
152508  /var/spool/squid
136524  /var/spool/squid/00
95736   /var/log/mrtg.log
74688   /var/log/squid
62544   /var/cache